747-400 Magnetic Detectors

From:         Tim Hills <Tim@cordle.demon.co.uk>
Organization: Timbo PLC
Date:         11 Aug 96 00:03:58 
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Does anyone know if an EFIS equiped aircraft has any magnetic compass
system other than the E2 standby compass?

In a recent flight deck discussion, on a 400, I said that I thought that
an IRS system needed an approximate heading reference for its initial
alignment. If it doesn't of course, then there is only ONE magnetic
compass in the entire aircraft. Answers from Boeing experts welcome.